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There could be several reasons for the failure of reading replica in MySQL replication, including:

1. Network issues: If there are connectivity issues between the master and replica servers, replication may fail.

2. Server overload: If the replica server is overloaded with too many read requests or the load is high, replication may fail.

3. Configuration errors: If the replication configuration is not set up properly, replication may fail.

4. Data consistency issues: If there are data consistency issues between the master and replica servers, replication may fail.

5. Incorrect permissions: If the replica server does not have the necessary permissions to access the data on the master server, replication may fail.

6. Version incompatibility: If the version of MySQL on the master and replica servers is not compatible, replication may fail.

7. Disk space issues: If there is not enough disk space on the replica server, replication may fail.